Our single-rivet boltless shelving units attach tightly to one another without using loose fasteners. All rivets in the boltless shelving are attached to all left to right and front to back beams and align with keyhole slots in the vertical posts. Boltless shelving is easy to assembly with using a rubber mallet just tap everything into place. All adder units have two standard T-posts, four left-to-right standard double rivet angle beams, two front-to-back standard double rivet angle beams, two left-to-right standard single rivet beam per intermediate leve and one fromt-to-back standard single rivet beam at one intermediate level.